Paper making apparatus



I April 25, 1933. w KELLETT 1,905,911

PAPER MAKING APPARATUS Filed May 11, 1932 0 Q fzz/erzz or;

' Q wz-zzmmzzfnszzez & fyw W W Patented Apr. 25, 1933 UNIT-ED STATESPATENT OFFICE WILLTAM R. KELLETT, F MENASHA, WISCONSIN, ASSIGNOR TOPAPER PATENTS GOmANY, OF NEENAH, WISGONSIN, A CORPORATION OF WISGONSINPAPER MAKING APPARATUS Application filed May 11,

This invention relates to paper making machines in which felts are usedfor picking up the web. Water is used as a shower for cleaning the feltor felts, which have be-' come quite saturated. If the felt or feltscarry any considerable amount of water, part of this excess water willtend to go into the web and is difficult to remove; The

- speed ofkth'e machine is therefore limited by drying capacity due tothe large amount of water which the felt itself carries. The web can beno drier than the felt which is carrying it, and every pound of waterthat can be removed from the felt represents a ing of the felt or feltsat high spec s,-while still maintaining the use of adequate water, whichnot only keeps the felt or felts clean but gives longer running lifebecause of the lubrication which excess water affords in contact withfelt-carrying rolls.

Briefly stated, the present invention resides in the application ofsuction press rolls tothe felt in advance of the point of pick up of theweb by the felt. The invention may be employed to advantage on eithersingle felt or double felt machines.

In the accompanying drawing, in which the figure is-a diagrammatic sideelevation, I have shown the invention applied to a Yankee paper makingmachine of the double felt type. 1

Referring to the drawing, 1 indicates a head box fromwhich the paperstock flows on the usual Fourdrinier forming wire 2. Said forming wireis trained around 'a breast roll 3 and a couch roll 41, passing over theusual table rolls 5 and suction boxes (not shown) if desired. The web isdesignated by 6.

An upper felt 7 is trained around an upper couch roll 8, a transfer roll9 that delivers the web to the drying drum 10, and suitably placed guiderolls 11, 12, 13, 14, 15 and 16. It picks up the web at the nip of thecouch rolls 4 and 8. A shower 17 applies a spray of cleaning water tothe August 7 1928.

1932. Serial no. 610,545.

upper felt at a point between the transfer roll 9 and guide roll 11.

A lower felt 18 is trainedover suitably placed guide rolls 19, 20, 21,22 and 23. It engages the web at the nip of suction press rolls 24:,between which latter the upper felt 7 and the web 6 also pass; the twofelts,

with the web between them, passing thence over the guide roll 19, atwhich point the lower felt 18 leaves the. web. A shower 25 applies aspray of cleaning water to thelower felt at a 21 and 22.

The machine as thus far described, including the suction press rolls 24located as described, is old and known. Suction presses, such as 241,have commonly been used to remove water from the felts and paper websimultaneously duringthe course point between the guide rolls of travelof the felts and web between the rolls, anexample of a suction rollbeing disclosed fill patent to Berry No. 1,679,598,

In the present invention, in order to remove excess water .from thefelts injf addition to that removed from the felts and web by thesuction'press rolls 24-,and before the felts, after cleaning, havecontacted with the web, I employ similar suction presses on either orboth of the felts. For example,

I have shown an upper pair ofv suction press rolls 26 through which theupper felt 7 is carried after it'has left the shower 17 and before itcomesinto contact with the web at the nip of the couch rolls l'fand 8.And

I have also shown a lower painglof suction press rolls 27 through whichthe lower felt is carried after it has left the shower 25 and before itpicks up the web at the nip 0f the suction press rolls 24.

The main advantages of these additional suction press rolls, located.and operatin substantially as described, are, that the we carries muchless water when it is applied to the drier, and thus the machine may be.run'ata considerably greater speed, there is much less wear on the feltsthan where plain wringer rolls are used which require very highpressures and are less efficient in removing water, the life of thefelts, is increased, and less water is required for clean ing where thewater is drawn out .of the felts.

- Dirt is picked off the surface rather than forced into theintersticesof the belt.

The term pair of suction rolls wherever used in the above description,is obviously intended to include any pair of cooperating rolls in whichonly one of the rolls is equipped with suction devices. In this art sucha pair of rolls is usually called a pair of suction rolls.

I claim:

1. In a paper-making machine, web forming means, web' drying 'means, afelt engaging the web between the forming means and the drying means, afelt washer, and a pair of suction pressure rolls engaged with said feltafter the latter leaves said washer and before it makes contact with theweb.

2. In combination with the web forming wire couch roll' and dryingcylinder of a paper-making machine, a pick-up felt and means forconveying the web into contact with the drying cylinder, a felt washer,and a pair of suction pressure rolls engaged with said felt between saidwasher and the point 'of pick-up of'said felt with the web.

3. In combination with the web forming wire, drying cylinder,and-transfer roll of a paper making machine, an upper felt conveying theweb from the forming wire to the transfer roll, a lower felt and meansfor guiding the same into contact with the under side of the webbetween" the forming wire and the transfer roll, washers for said feltsrespectively, and two pairs of suction pressure rolls respectivelyengaged f'with said felts at points between said washers and the pointsof pick up of said felts with said Web.

4. In combination with the "web forming wire, drying cylinder, andtransfer roll of a paper making machine, an upper felt conveying the webfrom the forming wire to the transfer roll, a lower felt and means forguiding the same into contact with the said web.

under side of the web between the forming wire and the transfer roll, apair of suction pressure rolls through which said felts with the webbetween them pass, washers for said felts'respectively, and two pairs ofsuction pressure rolls respectively engaged with said felts at pointsbetween said washers and the points of pick-up of said felts withWILLIAM R. KELLETT.

